Charlie Rose’s ties to Bloomberg LP are deepening as the erudite talk-show host will begin writing a weekly column for BusinessWeek, the magazine Mayor Mike Bloomberg’s company is set to take over today.

That’s happening as Steve Adler, the mag’s outgoing editor-in-chief, is heading to Thomson Reuters, according to sources familiar with the matter.

Rose will start his column with the Dec. 21 issue.

It marks the first significant columnist hire by Chief Content Officer Norm Pearlstine.

Word of Rose’s arrival comes as Bloomberg prepares to hand over a $9.3 million check to McGraw-Hill Cos. as part of its purchase of the magazine.

Adler’s role at Thomson Reuters could not be determined at press time, though there were hints more than a week ago that he might join the rival when he was seen at the table of Thomson Reuters CEO Tom Glocer at the New York Financial Writers Association’s annual party Nov. 20.